[dm-devel] snapshot scalability

From: "Haripriya S" <SHARIPRIYA novell com>

To: <dm-devel redhat com>

Subject: [dm-devel] snapshot scalability

Date: Thu, 10 Aug 2006 04:46:29 -0600

Hi,
A co-worker recently did some tests on DM snapshots using bonnie, and
here is a rough summary of what he got as write throughput:
No Snapshots - 373 MB/s
One Snapshots - 55 MB/s
Two Snapshots - 16 MB/s
Four Snapshots - 14 MB/s
Eight Snapshots - 6.5 MB/s
He is doing some more tests now to verify these results, but I wanted
to quickly check with the dm snapshot community. Are there any current
known scalability limits on snapshots and do the numbers mentioned here
look normal ?
Thanks and Regards,
Haripriya